Not starting when Backup Drive connected

My iMac wont start if our Verbatim external hard-drive which we use for Time Machine is connected. Once on, I can connect the drive Time Machine seems to back up perfectly. If the drive is in on startup, I am faced with a grey screen without a loading wheel. I can get around this problem by simply unplugging the drive, but this is a hassle and I am constantly forgetting to reinsert the drive to back into the mac.
Does anyone know what the problem is and how I might be able to fix it?
Thanks very much for all your help,
SM

Go to System Preferences > Startup Disk and select Macintosh HD as your startup partition

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